ALBANY - A Republican challenger to Sen. Hillary Rodham Clinton is bizarrely claiming that the former first lady has been spying in her bedroom window and flying helicopters over her house in the Hamptons, witnesses told The Post yesterday.

Former Reagan-era Pentagon official Kathleen "KT" McFarland stunned a crowd of Suffolk County Republicans on Thursday by saying:

"Hillary Clinton is really worried about me, and is so worried, in fact, that she had helicopters flying over my house in Southampton today taking pictures," according to a prominent GOP activist who was at the event.

"She wasn't joking, she was very, very serious, and she also claimed that Clinton's people were taking pictures across the street from her house in Manhattan, taking pictures from an apartment across the street from her bedroom," added the eyewitness, who is not involved in the Senate race.

And they're coming to take me away ha-haaaThey're coming to take me away ho ho hee hee ha haaaTo the funny farmWhere life is beautiful all the timeAnd I'll be happy to see those nice young menIn their clean white coatsAnd they're coming to take me away ha haaa

You thought it was a jokeAnd so you laughedYou laughed when I saidThat losing you would make me flip my lid

Right? You know you laughedI heard you laugh. You laughedYou laughed and laughed and then you leftBut now you know I'm utterly mad

And they're coming to take me away ha haaaThey're coming to take me away ho ho hee hee ha haaaTo the happy home with trees and flowers and chirping birdsAnd basket weavers who sit and smile and twiddle their thumbs and toesAnd they're coming to take me away ha haaa